Answers

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If one for one as equal traits in DNA or as twins, you will find the whole body in proportions vary or differ, they can not be identical due the genetics, the females organs do differ, and that includes the allusion of the norm, the pear shape and the potbelly genre are stereotypical correct,

So, pertaining to thighs we have to acknowledge the human anatomy as growth variants through life, and the female attributes will appear more rounded or volumputous comparatively to male, which has the upper torso generic build difference, ..
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Usually as we're designed to able to gestate a baby inside our abdomen whereas guys are engineered to be able to run and hunt. Of course these are just generalizations and most women diet and exercise to avoid fat thighs whereas most men do not.